SQL Server-按外观替换字符串

Question

有一个小问题...这是测试数据

CREATE TABLE #TestReplace (
    Description NVARCHAR(500)
    ,ParamValue1 INT
    ,ParamValue2 INT
    ,ParamValue3 INT
    );

INSERT INTO #TestReplace (Description)
VALUES ('This sentence has no parameteres, and it should be shown like this');

INSERT INTO #TestReplace (
    Description
    ,ParamValue1
    )
VALUES (
    'This sentence has only one parametere, and it should be shown right here {param} with rest of text'
    ,100
    );

INSERT INTO #TestReplace (
    Description
    ,ParamValue1
    ,ParamValue2
    )
VALUES (
    'This sentence has two parameteres, one here {param} and one here {param}, show full sentence'
    ,100
    ,200
    );

INSERT INTO #TestReplace (
    Description
    ,ParamValue1
    ,ParamValue2
    ,ParamValue3
    )
VALUES (
    'This sentence has all parameteres, here {param} and here {param} and there {param}'
    ,100
    ,200
    ,300
    );

在我的句子中，有时会出现单词 {param}，或者永远不会出现...，而列 ParamValue1， ParamValue2和 ParamValue3 ...如何将单词 {param}的第一次出现替换为 ParamValue1列的值，将第二个单词 {param}替换为 ParamValue2列的值第三列带有 ParamValue3列的值...我无法将单词 {param}更改为 {param1}， {param2}和 {param3}并进行简单替换

到目前为止，我设法只替换了第一次出现的情况...

SELECT CASE 
        WHEN CHARINDEX('{param}', DESCRIPTION) > 0
            THEN STUFF(DESCRIPTION, CHARINDEX('{param}', DESCRIPTION), LEN('{param}'), ParamValue1)
        ELSE DESCRIPTION
        END
FROM #TestReplace

在Oracle( Oracle - replace string by appearance)中可以轻松地对此进行管理

Answer 1

您可以使用APPLY将它们链接在一起:

SELECT COALESCE(v3.DESCRIPTION, v2.DESCRIPTION, v1.DESCRIPTION, tr.DESCRIPTION)
FROM #TestReplace tr CROSS APPLY
     (VALUES (CASE WHEN tr.Description LIKE '%{param}%'
                   THEN STUFF(tr.DESCRIPTION, CHARINDEX('{param}', tr.DESCRIPTION), LEN('{param}'), tr.ParamValue1)
              END)
     ) v1(description) CROSS APPLY
     (VALUES (CASE WHEN v1.Description LIKE '%{param}%'
                   THEN STUFF(v1.DESCRIPTION, CHARINDEX('{param}', v1.DESCRIPTION), LEN('{param}'), tr.ParamValue2)
              END)
     ) v2(description) CROSS APPLY
     (VALUES (CASE WHEN v2.Description LIKE '%{param}%'
                   THEN STUFF(v2.DESCRIPTION, CHARINDEX('{param}', v2.DESCRIPTION), LEN('{param}'), ParamValue3)
              END)
     ) v3(description);